Abstract
In the millennial era, the development of information and communication technology is very fast, one of the telecommunications infrastructure is a monopole type telecommunications tower. This type of tower is one of 3 types of telecommunication towers whose main construction is made of steel. The monopole structure is supported by a tread foundation, which is one type of shallow foundation. The main factor in the design of the tread foundation is the bearing capacity factor. Calculation of foundation bearing capacity can be done directly in the field using Sondir data (CPT) and indirectly using laboratory data. In this study a study was conducted to compare the carrying capacity of monopole foundations between field data methods in the form of Sondir data or CPT with result data. Soil tests in the laboratory calculated with the Terzaghi formula. The research location was carried out in Gresik Regency, East Java Province, Indonesia at 3 sites, namely: Mojosarirejo, Kembangan Kebomas and Setromenganti. The results of the comparison of the calculation of the bearing capacity of the foundation (Q) at the Mojosarirejo site with the type of sandy soil. value of QSondir < 9.58 % of Qterzaghi. At the Krembangan Kebomas site with brown clay and gravely clay, the Q value was < 69.93 % of the Qterzaghi and at the Setromenganti site with brown clay soil type with the influence of water level depth – 1 m, the Q value was < 27, 62% of Qterzaghi. From the comparison of the average calculation in the 3 study locations, the bearing capacity of QSondir treads foundation is 26.50 % smaller than Qterzaghi, so the use of Sondir data is more accurate for use in tread foundation planning and provides greater security assurance for the tower foundation structure. monopole type
Highlights
The development of telecommunication is increasingly advanced, and many people have used it and some even cannot be separated from their daily lives
Terzaghi provides a form factor influence on the ultimate bearing capacity based on the analysis of the foundation as follows [12]: qu = 1.3Nc + poNq + 0.4γBN γ, (1)
Where qu – ultimate carrying capacity; c – soil cohesion; po = Dfγ – overburden pressure at the base of the foundation kN/m2); γ – weight of soil volume that is considered to the groundwater level
Summary
The development of telecommunication is increasingly advanced, and many people have used it and some even cannot be separated from their daily lives. Telecommunication towers are towers made of a series of iron or pipes in the form of rectangles, triangles, or just long pipes [1]. Land area and tower height are among the issues that have been faced by telecommunications operators in terms of tower construction. Some soil mechanics have developed several methods to analyze the bearing capacity of the tower foundations. Let’s discuss in detail the comparative study of the bearing capacity of the monopole tower foundation using Sondir data and laboratory test data. Knowing the optimal method for planning shallow foundations, especially the bearing capacity of the foundation, will save costs and time
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